You can reduce your risk by creating another account before deleting the admin account.

username administrator secret MyPaSsWoRd

Then create another telnet session (leave the original one open) and authenticate with the username administrator. If successful you can delete admin and re-create or just use the administrator account.

Thanks but I am not sure I understand, there is a current username admin that I use to login to the router. You are suggesting creating a new one. Is that to overwrite/replace the current user? Maybe I should wait until I find a new company and run the risk.

You can reduce your risk by creating another account before deleting the admin account.

username administrator secret MyPaSsWoRd

Then create another telnet session (leave the original one open) and authenticate with the username administrator. If successful you can delete admin and re-create or just use the administrator account.